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Update the suction model as per Alex Perry's recommendations.

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curt 2003-05-28 18:48:00 +00:00
parent 80e300c65a
commit 3cd828b3b6
1 changed files with 7 additions and 5 deletions
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12
src/Systems/vacuum.cxx
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@ -50,12 +50,14 @@ VacuumSystem::update (double dt)
} else {
double rpm = _rpm_node->getDoubleValue();
double pressure = _pressure_node->getDoubleValue();
// suction = pressure * rpm / (rpm + 5000.0);
// This magic formula yields about 4.1 inhg at 700 rpm and
// about 6.0 inhg at 2200 rpm (numbers by observation)
suction = 5.39 - 1.0 / ( rpm * 0.00111 );
// This magic formula yields about 4 inhg at 700 rpm
suction = pressure * rpm / (rpm + 4875.0);
// simple regulator model that clamps smoothly to about 5 inhg
// over a normal rpm range
double max = 5.39 - 1.0 / ( rpm * 0.00111 );
if ( suction < 0.0 ) suction = 0.0;
if ( suction > 5.0 ) suction = 5.0;
if ( suction > max ) suction = max;
}
_suction_node->setDoubleValue(suction);
}